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CLASSIFICATION OF ANGLES. Angles Angles are classified according to their measures. Angles Angles are classified according to their measures.

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Presentation on theme: "CLASSIFICATION OF ANGLES. Angles Angles are classified according to their measures. Angles Angles are classified according to their measures."— Presentation transcript:

1 CLASSIFICATION OF ANGLES

2 Angles Angles are classified according to their measures. Angles Angles are classified according to their measures.

3 Acute Angles an angle measuring between 0 and 90 degrees

4 Obtuse Angles an angle measuring between 90 and 180 degrees

5 Right Angles an angle measuring exactly 90 degrees.

6 Obtuse Angles an angle measuring between 90 and 180 degrees

7 EXAMPLE 1 Measure and classify angles Use the diagram to find the measure of the indicated angle. Then classify the angle. a. KHJ b. GHK c. LHK d. GHL SOLUTION A protractor has an inner and an outer scale. When you measure an angle, check to see which scale to use.

8 EXAMPLE 2 Measure and classify angles a. HJ is lined up with the 0 on the inner scale of the protractor. HK passes through 55 on the inner scale. So, m KHJ = 55. It is an acute angle. o o b. HG is lined up with the 0 on the outer scale and HK passes through 125 on the outer scale. So, m GHK = 125. It is an obtuse angle. o o c. m LHK = 35. It is an acute angle. d. m GHL= 90. It is a right angle.

9

10 QUIZ 1. Name all the angles in the diagram at the right. Which angle is a right angle? an acute angle?

11 QUIZ 1. Name all the angles in the diagram at the right. Which angle is a right angle? an acute angle/s? PQR, PQS, RQS. PQS is a right angle..  PQR &  SQR are acute angles. ANSWER


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